Was able to run Ubuntu 10.04 as a guest on Ubuntu 8.10 using VB 2.0.4-OSE and Ubuntu 8.04 using VB 1.5.6-OSE. However, I had to press the F6 key at boot up and check both acpi=off and noapic. I downloaded the ISO from 3/22: $ wget -c -N 'http://cdimage.ubuntu.com/daily-live/current/lucid-desktop-i386.iso' Regards, - Robert